Sum of Digits in C using the while loop

Learn about Sum of Digits in C using the while loop in the below code example. Also refer the comments in the code snippet to get a detailed view about what’s actually happening.

Contents

Sum of Digits in C using the while loop

Program:

 #include<stdio.h>
 int main()
 {
     int number,lastDigit,sum=0;

     printf("Enter any number: ");
     scanf("%d",&number);

     while(number!=0)
     {
         lastDigit=number%10;
         sum += lastDigit;
         number/=10;
     }

     printf("Sum of digits =  %d\n",sum);

     return 0;
 }

Output:

Enter any number: 121
Sum of digits = 4

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